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Related Experiment Videos

A two-step scaffolding model for mitotic chromosome assembly.

Kazuhiro Maeshima1, Ulrich K Laemmli

  • 1Department of Biochemistry, NCCR Frontiers in Genetics, University of Geneva, 30, Quai Ernest-Ansermet, CH-1211 Geneva 4, Switzerland.

Developmental Cell
|April 12, 2003
PubMed
Summary

Topoisomerase IIalpha (topoIIalpha) and 13S condensin form the core chromosomal scaffold. Their assembly occurs in two steps during mitosis, creating a unique "barber pole" structure essential for chromosome shape.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Mitotic chromosome assembly requires both Topoisomerase IIalpha (topoIIalpha) and 13S condensin.
  • These proteins are crucial for establishing the structural integrity and shape of chromosomes during cell division.

Purpose of the Study:

  • To identify the main components of the chromosomal scaffold.
  • To elucidate the roles of topoIIalpha and 13S condensin in mitotic chromosome assembly.
  • To characterize the structural organization and assembly process of the chromosomal scaffold.

Main Methods:

  • Histone-depleted chromosome preparations.
  • ATP hydrolysis assays.
  • Immunolocalization studies.
  • Double staining techniques.

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  • Cell cycle analysis.

    • Main Results:

    • TopoIIalpha and 13S condensin are the primary components of the chromosomal scaffold.
    • ATP-dependent interactions stabilize the scaffold's structure and shape.
    • TopoIIalpha and 13S condensin form a "barber pole" structure with alternating enriched regions.
    • 13S condensin is recruited during the pro- to metaphase transition, suggesting a two-step assembly process.

    Conclusions:

    • The chromosomal scaffold is primarily composed of topoIIalpha and 13S condensin.
    • A two-step assembly mechanism, involving initial topoIIalpha scaffolding followed by condensin recruitment, shapes mitotic chromosomes.
    • The observed "barber pole" structure reflects the distinct contributions and spatiotemporal regulation of topoIIalpha and condensin.